Remove old webui History page on desktop and mobile

chrome/browser/flag_descriptions.h

Index: chrome/browser/flag_descriptions.h
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index dba02b38595c96dce6d29324df07878a9c0bc391..825e3ca407ce80f8b1099abc3b26faaa6ea7c5d8 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -33,14 +33,6 @@ extern const char kEnableMaterialDesignPolicyPageName[];
 // Description for the flag to enable the material design policy page.
 extern const char kEnableMaterialDesignPolicyPageDescription[];
 
-//  Material Design version of chrome://history
-
-// Name for the flag to enable the material design history page.
-extern const char kEnableMaterialDesignHistoryName[];
-
-// Description for the flag to enable the material design history page.
-extern const char kEnableMaterialDesignHistoryDescription[];
-
 //  Material Design version of chrome://settings
 
 // Name for the flag to enable the material design settings page.
@@ -2948,18 +2940,6 @@ extern const char kCrosCompUpdatesName[];
 // Description for the flag to enable Chrome OS component flash updates
 extern const char kCrosCompUpdatesDescription[];
 
-//  Native Android History chrome://flags strings
-
-#if defined(OS_ANDROID)
-
-// Name of the flag that enables the native Android history UI.
-extern const char kNativeAndroidHistoryManager[];
-
-// Description of the flag that enables the native Android history UI.
-extern const char kNativeAndroidHistoryManagerDescription[];
-
-#endif  // defined(OS_ANDROID)
-
 //  Play Services LSD permission prompt chrome://flags strings
 
 #if defined(OS_ANDROID)